Emergency Operation; Fc Defective; Controller Defective - Maersk Container Industry Star Cool SCI-20 Operating And Service Manual

92 of 112 pages

22. Emergency operation

Warning: High voltage. Unit must be disconnected from power. Only to be
done by trained personnel.

22.1 FC defective

If the FC is defective and no replacement part is available, the compressor may be run in On/off
mode. The defective FC is dismounted and the 3 phases are directly applied to the compressor sup-
ply terminals. Also a wire-jumper has to be fitted on the remaining 3 terminals, see below figure.
In the Service menu
to NONE. The unit will then run in On/off mode with deteriorated temperature controlling perfor-
mance. The connection for the FC is shown in the below wiring diagrams:

22.2 Controller defective

If the controller of the unit is malfunctioning or defective and no replacement is available, the unit
can be run in an Emergency mode with deteriorated temperature controlling performance. This
operation is only recommended for cargo being transported in Frozen mode with a setpoint below
-10°C (14°F). If the cargo is transported in Chilled mode, it is recommended that the defective
controller is replaced with one from a unit operating in Frozen mode.
The emergency procedure for a unit with a defective controller, running in Frozen mode, is as follows:
1. Dismount the frequency converter and connect the compressor directly to the power supply. Use
the contactor in the controller as a main switch for the compressor.
2. Connect the evaporator fans in low speed and the condenser fan in high speed directly to the
power supply.
3. Mount a permanent magnet on the electronic expansion valve, pos. 18 (P & I diagram).
4. Install a service gauge manifold on the unit to the two evacuation points, pos. 6 and 27 (P & I
diagram).
5. Close the stop valve, pos. 14 (P & I diagram).
6. Energize the fans and the compressor.
7. Carefully open the stop valve pos. 14 (P & I diagram), observing the pressure readings on the
service gauge manifold as this is done.
8. For a setpoint temperature of -20°C (-4,0°F) a suction pressure of -24°C (-11,2°F) is to be
maintained. In general, the suction pressure (temperature) is to be 5°C (7°F) below the set
point temperature. In general, the discharge pressure (temperature) is to be 10°C (18°F)
above ambient temperature.
9. If there is ice building up on the compressor, it indicates that there is coming too much liquid
back from the evaporator. Close the stop valve, pos. 14 (P & I diagram) slightly.
Operating and service manual
, under S05 Configuration, select line F03 FC TYPE and set the parameter